help I have spots on side of foot don’t know what they are

So I have 4 spots on side of my left foot not sure what they are. It started couple weeks ago with one and it’s up to 4 now they were soft and the first one is now hardened…picture Included

So I have 4 spots on side of my left foot not sure what they are. It started couple weeks ago with one and it’s up to 4 now they were soft and the first one is now hardened…picture Included

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help I have spots on side of foot don’t know what they are